Insider Transaction Report for John A. Vaccaro

This filing details a transaction by John A. Vaccaro, a director at COMMUNITY FINANCIAL SYSTEM, INC. (CBU). On September 17, 2026, Vaccaro acquired 346.5031 units of Deferred Stock, which are economically equivalent to shares of the company's common stock. The acquisition was part of the Deferred Compensation Plan for Directors and will be settled in common stock at a future date. The price per unit was $62.77, and following this transaction, Vaccaro holds a total of 983.8701 units. This transaction is classified as an acquisition under the "A" transaction code.